<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF_8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="1-flex-direction.css">
</head>

<body>
    <div class="flex_direction_row">
        <div class="div_item">
            <span>1</span>
        </div>
        <div class="div_item">
            <span>2</span>
        </div>
        <div class="div_item">
            <span>3</span>
        </div>
        <div class="div_item">
            <span>4</span>
        </div>
    </div>

    <div class="flex_direction_row_reverse">
        <div class="div_item">
            <span>1</span>
        </div>
        <div class="div_item">
            <span>2</span>
        </div>
        <div class="div_item">
            <span>3</span>
        </div>
        <div class="div_item">
            <span>4</span>
        </div>
    </div>

    <div class="flex_direction_colume">
        <div class="div_item">
            <span>1</span>
        </div>
        <div class="div_item">
            <span>2</span>
        </div>
        <div class="div_item">
            <span>3</span>
        </div>
        <div class="div_item">
            <span>4</span>
        </div>
    </div>

    <div class="flex_direction_colume_reserve">
        <div class="div_item">
            <span>1</span>
        </div>
        <div class="div_item">
            <span>2</span>
        </div>
        <div class="div_item">
            <span>3</span>
        </div>
        <div class="div_item">
            <span>4</span>
        </div>
    </div>
</body>

</html>